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Retirement Benefits - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) employee | Sep. 30, 2019 USD ($) employee | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions by employer |  | $ 0.1 |
Participants affected due to plan freeze | employee | 60 | 60 |
Decrease in liability due to plan freeze |  | $ 1.2 |
Other (Income) Expense Net |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement loss recognized | $ (0.5) | $ 0.5 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution for next fiscal year |  |  | $ 0.6
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution for next fiscal year |  |  | $ 1.1

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